Ba3Ta6Si4O26
Choisnet J, Nguyen N, Groult D, Raveau B
Materials Research Bulletin 11 (1976) 887-894
De nouveaux oxydes a reseau forme d'octahedres NbO6 (TaO6) et de groupes Si2O7:
Les phases A3Ta6Si4O26 (A = Ba,Sr) et K6M6Si4O26 (M = Nb,Ta)
_database_code_amcsd 0014243
9.001 9.001 7.734 90 90 120 P-62m
atom    x    y    z Biso
Ba   .595    0   .5 2.14
Ta   .242    0 .239  .80
Si    1/3  2/3 .207  .87
O1    1/3  2/3    0 1.55
O2   .314    0    0 1.27
O3   .809    0 .242 1.55
O4   .500 .174 .279  1.4
O5   .208    0   .5 1.62